G19 



Stromata gregarious, subinnate, parallel, irregular, variously con- 

 fluent, black, shining, at first smooth, then punctate-roughened by the 

 sul (prominent ostiola. Ascigerous cells seriate, connate, depressed- 

 globose or flat-hemispherical, 180-210 /i broad and about 80 fi high. 

 Asci oblong, short-stipitate, 8-spored, 70-75 x 15-17 [jl. Sporidia 

 biseriate, oblong-fusoid, attenuated and rounded at the ends, and with 

 a short, subglobose, hyaline appendage, 3- (rarely 5-) septate, 28- 

 30 x 7 fi. 



On dead stems of Pteris aquilina, Center, N. Y. (Peck). 



The N. Y. specc. have (sec, Peck) sporidia 25-27 fi long. 



The stromata are covered by the blackened epidermis which is 

 raised into elongated, variously confluent, black blotches. We have 

 seen no American specimens. 



Rh. clavisporus, (C. & P.) (Plate 28, figs. 6-7) 



Dothidea clavispora, C. & P. 29th Rep, N. Y. State Mus. p. 63. 

 Hyslerium clavisporum, C. & P. 28th Rep. p. 69. 

 Leptosphceria clavicarpa, E. & B. Journ. Mycol. I, p. 43. 



Stromata innate-erumpent, narrow, oblong or elliptical, contain- 

 ing 2-10 perithecia or often linear-elongated, \-\ cm. long, partially 

 erumpent through cracks in the epidermis which is raised into parallel 

 ridges. Perithecia seriate, 150-200 // diam. Ostiola obtuse, incon- 

 spicuous. Asci broad, oblong-cylindrical, 75-100x22-25 //, obtuse, 

 with a short, narrow base. Paraphyses filiform. Sporidia crowded 

 in several series, clavate-oblong, slightly curved, obtuse and rounded 

 above, narrowed rather abruptly below, 7-9-septate, and when mature, 

 deep yellow-brown, 25-40x8-10 p., only slightly constricted at the 

 septa. Spermatia in similar perithecia. oblong-cylindrical, slightly 

 curved, hyaline, 3-5 xlj ii. The general appearance is that of 

 Sphwria orthogramma, B. & C. 



On dead culms of Phragmitis communis, New York (Peck), 

 Iowa (Arthur). 



The ascigerous cells assume the character of true perithecia. at 

 least in the mature specc, and are connate in a single series. The 

 substance of the scanty stroma is brown inside. 



0PHI0D0THIS, Sacc. 



Syll. II, p. 652. 



Stroma contracted or broadly effused, somewhat flattened, granu- 

 lose, becoming black. Asci elongated, 8-spored. Sporidia filiform, 

 continuous, hyaline, sometimes multinucleate. 



